One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,6)(3,7,8,5)(9,10)(11,13)(12,14)(15,16)(17,18,22,24)(19,28,31,40)(20,26,33,38)(21,27,23,36)(25,34,37,30)(29,43,45,48)(32,41,35,42)(39,44,47,46)(1,3,4,8)(2,5,6,7)(9,11)(10,13)(12,15)(14,16)(18,24)(25,37)(26,38)(27,36)(28,40)(39,47)(41,42)(43,48)(11,15)(13,16)(17,19,21,34,22,31,23,30)(18,25,36,40,24,37,27,28)(20,29,35,44,33,45,32,46)(26,39,41,48,38,47,42,43)(11,15)(13,16)(17,20,22,33)(18,26,24,38)(19,29,31,45)(21,35,23,32)(25,39,37,47)(27,42,36,41)(28,43,40,48)(30,46,34,44)(10,14)(13,16)(17,21,22,23)(18,27,24,36)(19,30,31,34)(20,32,33,35)(25,40,37,28)(26,41,38,42)(29,44,45,46)(39,43,47,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.